Why carbon di oxide evolves when carbonated water reacts with sodium chloride?

Answer 1

First: sodium chloride does NOT react with water, H2O, nor with carbon dioxide, CO2.

However when some fine salt particles are put in a glass of carbonated water, a lot of gas bubbles evolve from the dissolving particles.

When completely dissolved almost nothing will occur. How come?

At the 'liquid (carbon. water) / solid (salt part'ls)' interface there will be a 'struggle' for water molecules, won by the much more soluble salt particles, lost by the rather badly soluble gas molecules. That's how those carbon dioxide molecules are 'stripped off' their surrounding -solublizing- water molecules, now only capable of 'sticking' together in (escaping) gas bubbles.